
export class GVerifyContainer {
  public options: any;
  GVerify(options) { // 创建一个图形验证码对象，接收options对象为参数
    this.options = { // 默认options参数值
      id: options.id, // 容器Id
      canvasId: options.canvasId, // canvas的ID
      width: '100', // 默认canvas宽度
      height: '35', // 默认canvas高度
      type: 'number', // 图形验证码默认类型blend:数字字母混合类型、number:纯数字、letter:纯字母
      code: ''
    };

    if (Object.prototype.toString.call(options) === '[object Object]') {// 判断传入参数类型
      for (let i of options) { // 根据传入的参数，修改默认参数值
        this.options[i] = options[i];
      }
    } else {
      this.options.id = options.id;
    }

    this.options.numArr = '0,1,2,3,4,5,6,7,8,9'.split(',');
    this.options.letterArr = this.getAllLetter();

    this.init();
    this.refresh();
  }

  init() {
    let con = document.querySelector('#' + this.options.id);
    let canvas = document.createElement('canvas');
    this.options.width = this.options.width;
    this.options.height = this.options.height;
    canvas.id = this.options.canvasId;
    canvas.width = this.options.width;
    canvas.height = this.options.height;
    canvas.style.cursor = 'pointer';
    canvas.innerHTML = '您的浏览器版本支持canvas';
    con.appendChild(canvas);
    let parent = this;
    canvas.onclick = () => {
      parent.refresh();
    };
  }

  /**生成验证码**/
  refresh() {
    this.options.code = '';
    let canvas = document.getElementById(this.options.canvasId);
    let ctx: any;
    if (canvas['getContext']) {
      ctx = canvas['getContext']('2d');
    } else {
      return;
    }

    ctx.textBaseline = 'middle';

    ctx.fillStyle = this.randomColor(180, 240);
    ctx.fillRect(0, 0, this.options.width, this.options.height);
    let txtArr: any;
    if (this.options.type === 'blend') { // 判断验证码类型
      txtArr = this.options.numArr.concat(this.options.letterArr);
    } else if (this.options.type === 'number') {
      txtArr = this.options.numArr;
    } else {
      txtArr = this.options.letterArr;
    }

    for (let i = 1; i <= 4; i++) {
      let txt = txtArr[this.randomNum(0, txtArr.length)];
      this.options.code += txt;
      // ctx.font = this.randomNum(this.options.height / 2, this.options.height) + 'px SimHei'; // 随机生成字体大小
      ctx.font = '24px SimhHei';
      // ctx.fillStyle = this.randomColor(50, 160); // 随机生成字体颜色
      ctx.fillStyle = '#333333';
      // ctx.shadowOffsetX = this.randomNum(-3, 3);
      // ctx.shadowOffsetY = this.randomNum(-3, 3);
      // ctx.shadowBlur = this.randomNum(-3, 3);
      ctx.shadowColor = 'rgba(0, 0, 0, 1)';
      let x = this.options.width / 5 * i;
      let y = this.options.height / 2;
      let deg = this.randomNum(-30, 30);
      /**设置旋转角度和坐标原点**/
      ctx.translate(x, y);
      ctx.rotate(deg * Math.PI / 180);
      ctx.fillText(txt, 0, 0);
      /**恢复旋转角度和坐标原点**/
      ctx.rotate(-deg * Math.PI / 180);
      ctx.translate(-x, -y);
    }
    /**绘制干扰线**/
    // for (let i = 0; i < 4; i++) {
    //     ctx.strokeStyle = this.randomColor(40, 180);
    //     ctx.beginPath();
    //     ctx.moveTo(this.randomNum(0, this.options.width), this.randomNum(0, this.options.height));
    //     ctx.lineTo(this.randomNum(0, this.options.width), this.randomNum(0, this.options.height));
    //     ctx.stroke();
    // }
    /**绘制干扰点**/
    // for (let i = 0; i < this.options.width / 4; i++) {
    //     ctx.fillStyle = this.randomColor(0, 255);
    //     ctx.beginPath();
    //     ctx.arc(this.randomNum(0, this.options.width), this.randomNum(0, this.options.height), 1, 0, 2 * Math.PI);
    //     ctx.fill();
    // }
  }

  /**验证验证码**/
  validate(code) {
    if (code) {
      code = code.toLowerCase();
      let v_code = this.options.code.toLowerCase();
      if (code === v_code) {
        return true;
      } else {
        this.refresh();
        return false;
      }
    }
  }
  /**生成字母数组**/
  getAllLetter() {
    let letterStr = 'a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z';
    return letterStr.split(',');
  }
  /**生成一个随机数**/
  randomNum(min, max) {
    return Math.floor(Math.random() * (max - min) + min);
  }
  /**生成一个随机色**/
  randomColor(min, max) {
    let r = this.randomNum(min, max);
    let g = this.randomNum(min, max);
    let b = this.randomNum(min, max);
    return 'rgb(' + r + ',' + g + ',' + b + ')';
  }
}
